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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e78f8c9aea9e21af2df5cd10d0b9e46babd790b66f817ebdab53234698869c32' 
  AND token = 'qyYjHVqhgSb1bQOX0Xg9L0JSPWJx53nq//ewOH5Hlfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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