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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090f28b9c12ac8a7ba7977de1371fbd55da480ca95f123692bc0eb526dcc4167' 
  AND token = 'YN44s4BNPvuySk1w5/tGkYxjAycLDQRYIMPaKyY2Lzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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