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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b899d5704f0fb8be816d7aedbf6ff1b81765b68f9f48f82bcc0f5014ae176ae8' 
  AND token = '9YQZfGd7vc0wj2Bb0ZxLknXPX7ZtAoogCSgYghSN9J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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