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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '110ab8bbc6ff8b0e4986880a42db16e8776346c1310117549ab801285f1e7a91' 
  AND token = 'Xa4WDzcnW8GzJ3dc8k2UegKSib9A6SnqYJXaLg2gSgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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