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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf4d58acf4b971c69ee1aeb2e02f0c5e5018183332b3ce580cf359553ddc1ef' 
  AND token = 'PBRgd1EKCK7u+mcsp08i99o7j7ngDf0KDI6qIPPH0kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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