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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c37412d7208c87277b2b07d73778d172e060edda74e0ad85068e78f894e46c8' 
  AND token = 'PfqjpVbSHZ6RC6j0cNhb3gHuW1La7EjBGxfc1Gf/h6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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