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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1afe5cc4ffff746c2a23238905ac3a4e516eaf856c8e5d4b1e7645d7fb3f8a9' 
  AND token = 'faWbd8HL6Po5sY2wWm7bSmT5NumfMXraZ0wblg4HQ3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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