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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31c0dfee97dd0c6196f2cc7211bd22acd473c7cf4281fd21345f48fee8f2839' 
  AND token = 'fTrB5Ne9Cra1kmdkw9F89knmCNfqYJfMx2DYRWmNI5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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