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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa437267eb341828ecd1122c5494f2d5698dba74133c11a6d02ed6eb4cdedbd1' 
  AND token = '3FLwtQ4s0Y4AfALpzlEpXelhp3BGzoIA9rjDwACoFwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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