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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984f41a0e18aed5339bf5195fc70c47b8812105bbdbf17d2bf9a537787c9879c' 
  AND token = 'ztXdegsHXDNBOFqmf3ySnb8z4AGl7/hTJKODWrjEAHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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