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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e6aaff8d1aff2e751e6934da0cfcf58b21c0552cd85a1473f563c85be1c637' 
  AND token = 'E8M5SEKGMhhutFzbqUbeiRZhjEvx4bM9hQx748bPq0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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