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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee55646fe9b4a93ba13ed5119ca71280931fcb8ca523d59a953bceda5dbc8d3' 
  AND token = 'hds1NygXhaNnT7mmwamI3HTEPvLGQt+dlLDrD6imzN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}