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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd80eacc17488a491ced1cbc765e4e2e72fcce98d89f6048e958fbdbf3952108d' 
  AND token = 'jGTtkW1itAL9qBMhb8O3tL09MpdYGBFHGJlGk4vLJZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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