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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5acfc02547f8d65b93da68410880162b11f666cd957ea930c1b90007ba9cc0' 
  AND token = 'RRXqoPTY9ry2CkHngBpxDEgjrIcGWp6tgsyHz8dTWiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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