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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de210d0572143580643a9c6fbaf5c440e16139b7870ab2a1f0868d935ef387d' 
  AND token = 'QPkFeuI+qAc7CjxLRd+pcHADtj5vg6EN00llXUIpjMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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