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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dd8990e9885b72b41dd184d6b60b92ff6872cd33a8618496694feeb760c2aff' 
  AND token = 'LREpWWrX76sCmMvU0TTgufEyEQvx0mA6fv5Xtt8m6rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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