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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac0f063e17ae27fb03fdde585fc44dc45fc1aa8a7c4e0abd9231f3adc3a21aa6' 
  AND token = '1d4+BSejsBCP4SPT6Op3gXzNhsDWc3tctAnpimJIndQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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