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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c2f6444f7c4ddb2f5bc00dbc0c7f8cce33e13c5a60a5a3a1bfccb536fce937' 
  AND token = 'HMrhwwW8MHZJfRV5wI9Dm2nsLFReoQRKbxqCgD2khFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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