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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08f93d7096853004c8d010f69c1c89a0b4d3fba022d150622542e24ba379669' 
  AND token = '+Yg204chK1EYG4m9jb+i+UywDi64zt0lYwNcePOq0Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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