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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45a31ec7c199225f804c4267f8f619c433f1959e834b5dd0d56d853c52e060fa' 
  AND token = 'BqoLxfP4VNRpZSLU2WmZlcUaRuhhynDCWEYj1dIH2dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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