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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934fb4d7fa6d51d08e912ff779c19eb0474ea1a6b5a718a77591e7a7a91a0ef6' 
  AND token = 'le/yx32fZGFOAIHgNiUqZAp1/Ht31285KZmaTQgTbHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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