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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc723c15e3f6b3f91c21ece28dc9fef36007df357e14f7e0aadd059e3ef0f5e' 
  AND token = '8TN2ieVPWjGb0PcGjfTOvI6vumBUy9BF9PLVJ1VtFzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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