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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74fd39f967847d4e264190c8a7ce3fbdba8cb2b1235ee6d2c20ee7e7491c328c' 
  AND token = 'z7jLwIWOceAKAKVh4am2RBGqiimavjHY4iui8u3IVCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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