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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36158772257cb0dea61d3d61d4c797810e16eb4c0f87c26e448bb3ffe7f8779c' 
  AND token = 'dt5sjYGG+uekCTLvHbLnVT5LF43IQCSIStndXiqgIG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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