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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594fa11c7554064fb0f12b1ef96bf31d42a5435da2116f4ed06d641dbf42d21d' 
  AND token = 'zdtwJyi7nMhVPIzCmaC2uu8OkQ+K+sfcUk4VGZ7DkP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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