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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0d12af97697719c197dd346af0c0f2f2347ca7240d4b7bd432499dedec551a' 
  AND token = '47x/ymhZWmON9kLKLFO58iX1b0F8bsCz6n0pHEmNTh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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