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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'def0e964a391b9f2d05a5745c5a4dbd08e324f9843681b509357434a7d16cb95' 
  AND token = '8m8DgCIeFe9OAvXY8x1pHTiKJCycmqrV0K9SRZE7MVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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