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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc16ddf1891359cc3735fc52a0661345559f31d31d37625b366c083a1bca317' 
  AND token = 'TdS9PLdwqbqfn2LIpEwGIBrms1UpHThi7Gz/Ut5NrVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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