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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dfc8aa31e4e1da84b8fa6a9051c346c7e2bcb8ab3f0ff9aa9b1babe02553de5' 
  AND token = 'NU+XdZNl2rpiK8yPMrj0q47Ge/s2XRYl3XQipKdEO54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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