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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a25e662b3cd65688e2465118b84fed630cfba9543675fd0bbad5f2984e97d6' 
  AND token = 'hi1zdli10jSHX18iHhVdP5AJizxPGXbYXXWL3C5A+ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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