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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa3b237fc5a95c9f4225f480fec9099bda83f2f5ab9d56c35eba86b830db704' 
  AND token = '/U1dp/2xT2Stxecand+17Z5Lmb7M7shjbUfZOnPF3Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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