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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a01e747d037cdfd15e239bc37150672459fdbb222c003728fe1962b15814f0' 
  AND token = 'DcA19qM/pX5NlZ9XVZc95GjN7s5Gki+CE4tJAohGoxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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