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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c8014125c7972089c2a318ee7c4cc842a1def7268298ec4a6bb6179c402ab0' 
  AND token = 'TglaIk06qPFEoQ+BLdalBJoGBMLNA8Ks6q2B6NpKlOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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