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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb5af9ac2293286e222755f7f660d0bd6b0258326989e0065b09d2e3a63acaa' 
  AND token = 'J38w11gHJyjsmOkAvjXmCjkv3HrAiuzQFbUznFmc2Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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