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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0df6321f77577d714b769e9a9367b9203a28d362c514535b58e9c7e3e0a312a' 
  AND token = 'bqP8Z5rY4QEi7q+TkUS5VOm/Gb/Vm8+c87ulW9Pbdfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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