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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2e4ca64701ce1ce033ee3f0a9cc09ae7c14a3becda8f043c7d0322ad9b8e26c' 
  AND token = 'npng0N4fRaPEcx5AVeNPrXtP2d8/9VIDRUrbpHBw4rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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