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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e63bdea543dbac8914dec74fee7ad27bbeae549b3768e1b2bce3cd88b5f8e24a' 
  AND token = '1TmhBWzy3SCpO6KQv5JKc/X1A2l72gerLC3fjuc0bHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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