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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '211fbcbd7565c1988412d4a50c06cf0f1ba649bc1a90d09c1a1c2d750aa792b4' 
  AND token = 'pV7DkyM0fqMgXwgmXVQ6UCieyb+IR1o/rTpd6S4t7F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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