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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55125e8670e268d6e9afb8f247ecf2de6bf27bb444270514a4e913ed21d14d74' 
  AND token = 'YojfUIVzUy5iyULr+d/7V8s3W8wZ6K5DyXTu1F7zbGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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