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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54fdac7d626154558792d80d8909ddc621a992c7c6dab6c1ba6e4f28ef51566d' 
  AND token = 'kUNvVA0KRAu8ffI4EtfzDf2lEPWw0PPH5Slgq71bgIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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