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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e670aad99631ec72d2fc82b559e50522df224bbfa28de4a214cd25767b871887' 
  AND token = 'wxJeB79G8FEhmoIrSO4WKc4vWil50+pJ1ETaSGkNdas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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