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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb8cb3eef0098265a1676a6895331883ec1e6238227b681d38b2ccff74bd59e' 
  AND token = 'Vm26uraUkOne8fw+aQ89UJ7qMAgdvUv04sb2wG+wOTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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