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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '652a6d3a7feb85cb4877136036be6648cfaaa09cb18a578bee8cc7bc1db8391a' 
  AND token = '0gUpLjAYWv8r9LNd6ouSPLpEji4+tWySfas+UtGrJFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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