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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f8e7bf7cefdf74fe7e1e4edf31b2870f95208bc4855b4a45180021ab06bba2' 
  AND token = 'JLsQnypfeTm0x+B9xa97vJmyCkHok1WgfFFpYIVtkLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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