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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1279514355a0b8ddcca763956da017d76ba85d40eb5b69ece5507d19af3adf93' 
  AND token = 'IysnPw+xR4M+KonkAJSA8D4Q0xF1m0fXuhO3sOrMSYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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