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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64938c83518ef73e8433c47ef81c8ea146a7e0291d87df5423621787a6ee517a' 
  AND token = 'Xkdn2qGWK4WX3btK5A1CQcMO4gUk1fwKChIgw1+LUpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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