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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34de82813b0f11b486bb66e8d66cc426f2e4e4553405bb5fc3fadf2f4fc530a9' 
  AND token = '8SsMcq1SP3xuOn8+USsLFXB0G1DufIYR4dbV//HsF7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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