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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0404e5edb357cf27b219071e32278001401b488b240c1d2d7679e0e08a0240' 
  AND token = 'OjIs7L7clLwDClcu/gd0DGE1+ZxJvmX6QL3FOy1PNgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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