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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '626bc5676ddba2d1f8f70791b4779f296832c1be27d4f8d1bf0b33b6d9bb130e' 
  AND token = '7R3UV9ztwrjhUVZG71+1UUHPi+sfMSB+05SLEhDA2YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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