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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0c62fd06b76092ea1367360125f01602a90ba33053a1747af0d998f6181ffd' 
  AND token = '/Pld7hqTuGCv/+di19kSoLjdgu3CLrGSnkEc/iVI+Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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