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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afe15e7f2098b7f6c73fc3d9a0b6999b965f0e1ff8e6d81ad87369fdfe5aef55' 
  AND token = '5olWt7nOu6LPbcs3ADfv69QnluOEy+0HPc7cJeJrPDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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