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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8f27cb9d0ee465df60181fd9ebf35eef25b55ad36e6a154aef79cd7579e8193' 
  AND token = 'Mm9FjpRb8sKb00fzxc8fjVNRsrGYAEA3Fudw/QO4eRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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