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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba85bafc30b04a3afd9b23abbc747adf5c4134748d6371943eddd8798e52bc56' 
  AND token = 'gtsizzad8K+TtyxRzT0Iv74DoetEqb1uZQ5Rkt2+ksI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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