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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c384d36d339553b41ee9025eb9907966b38f7313a67b80f04c849b04457af8' 
  AND token = 'W+J0C0tt+YRQLNZ5/0iUbSKylMaoc7kF789jOB67STA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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