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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '639e874d4fa586f1f1744de058e8d94afe628586e7e712209854f1b071b9e1b2' 
  AND token = 'Sy9K2dE3fuIazfw0ftYdKbqwsEsvgI3Z3Oxl8R+3JaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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